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A Method for Determining the Camber and Twist of a Surface to Support a Given Distribution of Lift

Description: "A graphical method is described for finding the shape (camber and twist) of an airfoil having an arbitrary distribution of lift. The method consists in replacing the lifting surface and its wake with an equivalent arrangement of vortices and in finding the associated vertical velocities. By a division of the vortex pattern into circular strips concentric about the downwash point instead of into the usual rectangular strips, the lifting surface is reduced for each downwash point to an equivalen… more
Date: August 1942
Creator: Cohen, Doris
Item Type: Refine your search to only Report
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Normal-pressure tests of circular plates with clamped edges

Description: A fixture is described for making normal-pressure tests of flat plates 5 inches in diameter in which particular care was taken to obtain rigid clamping at the edges. Results are given for 19 plates, ranging in thickness from 0.015 to 0.072 inch. The center deflections and the extreme-fiber stresses at low pressures were found to agree with theoretical values; the center deflections at high pressures were 4 to 12 percent greater than the theoretical values. Empirical curves are derived of the pr… more
Date: June 1942
Creator: McPherson, Albert E.; Ramberg, Walter & Levy, Samuel
Item Type: Refine your search to only Report
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Normal-pressure tests of rectangular plates

Description: From Summary: "Normal-pressure tests were made of 56 rectangular plates with clamped edges and of 5 plats with freely supported edges. Pressure was applied and the center deflection and the permanent set at the center were measured. For some of the plates, strains and contours were measured in addition."
Date: June 1942
Creator: Ramberg, Walter; McPherson, Albert E. & Levy, Samuel
Item Type: Refine your search to only Report
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On the Distribution of Stress in a Thin Plate Elastically Supported Along Two Edges at Loads Beyond the Stability Limit

Description: Note presenting the results of an investigation on the distribution of stress in a plate elastically supported along two edges and subjected to compressive loads in a direction parallel to the elastically supported edges. A theoretical calculation was carried out in which the influence of the elastic support was taken into account.
Date: October 1942
Creator: Dunn, Louis G.
Item Type: Refine your search to only Report
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The Photoviscous Properties of Fluids

Description: Note presenting a method that has been developed to permit the extension of the methods of photoelasticity to include the measurement of velocity distribution in a moving fluid. The method is based on the fact that viscous shear in certain liquids gives rise to double refraction, which may be linearly related to the shear stresses.
Date: February 1942
Creator: Weller, R.; Middlehurst, D. J. & Steiner, R.
Item Type: Refine your search to only Report
open access

Results of landing tests of various airplanes

Description: Report presenting a study of the landing characteristics of various airplanes with special attention paid to problems with landing gear design. The planes ranged from 1000 to 50,000 pounds and in span from 28 to 149 feet. Results regarding the observed landing conditions, including attitude, vertical velocity, pitching velocity, rolling velocity, lateral velocity (or side drift), and landing gear loads measured during the tests are provided.
Date: September 1942
Creator: Hootman, J. A. & Jones, A. R.
Item Type: Refine your search to only Report
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Rise in temperature of the charge in its passage through the inlet valve and port of an air-cooled aircraft engine cylinder

Description: Report presenting an experimental determination of the heat transfer between the air stream and a model of the inlet valve and seat of an air-cooled aircraft type cylinder (Wright J-6) as a function of air flow and valve lift. The circumstances of the test are described and the pressure and temperature rise characteristics are provided.
Date: January 1942
Creator: Forbes, J. E. & Taylor, E. S.
Item Type: Refine your search to only Report
open access

A Rosette Strain Computer

Description: Note presenting a description of an electrical apparatus that serves as a computer for the evaluation of linear strain measurements taken in rosette fashion on the surface of a structural element carrying tension or compression and shear. The solution of the strain circle is accomplished by coupled rotary transformers, one representing each of the rosette gages.
Date: December 1942
Creator: Klemperer, W. B.
Item Type: Refine your search to only Report
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Square Plate With Clamped Edges Under Normal Pressure Producing Large Deflections

Description: "A theoretical analysis is given for the stresses and deflections of a square plate with clamped edges under normal pressure producing large deflections. Values of the bending stress and membrane stress at the center of the plate and at the midpoint of the edge are given for center deflections up to 1.9 times the plate thickness. The shape of the deflected surface is given for low pressures and for the highest pressure considered" (p. 1).
Date: May 1942
Creator: Levy, Samuel
Item Type: Refine your search to only Report
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Stability of elastically supported columns

Description: A criterion is developed for the stiffness required of elastic lateral supports at the ends of a compression member to provide stability. A method based on this criterion is then developed for checking the stability of a continuous beam-column. A related method is also developed for checking the stability of a member of a pin-jointed truss against rotation in the plane of the truss.
Date: November 1942
Creator: Niles, Alfred S. & Viscovich, Steven J.
Item Type: Refine your search to only Report
open access

Strength tests of thin-walled elliptic duralumin cylinders in pure bending and in combined pure bending and torsion

Description: An analysis is presented of the results of tests made by the Massachusetts Institute of Technology and by the National Advisory Committee for Aeronautics on an investigation of the strength of thin-walled circular and elliptic cylinders in pure bending and in combined torsion and bending. In each of the loading conditions, the bending moments were applied in the plane of the major axis of the ellipse.
Date: June 1942
Creator: Lundquist, Eugene E. & Stowell, Elbridge Z.
Item Type: Refine your search to only Report
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Stress Analysis of Monocoque Fuselage Bulkheads by the Photoelastic Method

Description: Note presenting an investigation to determine the possibility of using the photoelastic method for the stress analysis of bulkheads in monocoque structures. The method was applied to several typical bulkheads including a circular ring with floor beam, a circular ring attached to the main wing spar, and a flying-boat bulkhead.
Date: December 1942
Creator: Ruffner, Benjamin F.
Item Type: Refine your search to only Report
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A study of general instability of box beams with truss-type ribs

Description: The design of truss-type ribs for box beams is theoretically treated with regard to the function of the ribs in stabilizing the compression flange. The theory is applied to a design problem, and the results of this application are presented and discussed in relation to the general problem of rib design. The results of some tests made as a part of this general study are presented in an appendix.
Date: November 1942
Creator: Lundquist, Eugene E. & Schwartz, Edward B.
Item Type: Refine your search to only Report
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Summary of Results of Tests Made by Aluminum Research Laboratories of Spot-Welded Joints and Structural Elements

Description: "Available information concerning spot welding as a means of joining aluminum-alloy parts has been summarized and comparisons have been made of the relative merits of spot-welded and riveted aluminum-alloy structural elements. The results indicated that spot welding was as satisfactory as riveting insofar as resistance to static loads is concerned. Spot welds showed slightly lower resistance to impact loads but definitely lower resistance to repeated loads than rivets" (p. 1).
Date: November 1942
Creator: Hartmann, E. C. & Stickley, G. W.
Item Type: Refine your search to only Report
open access

A summary of results of various investigations of the mechanical properties of aluminum alloys at low temperatures

Description: The available sources of data on the mechanical properties of aluminum alloys at low temperatures are listed and a summary of the material to be found in each source is given. There is included a discussion of the results of recent tests of aluminum alloys at low temperatures made at the Aluminum Research Laboratories.
Date: May 1942
Creator: Hartmann, E. C. & Sharp, W. H.
Item Type: Refine your search to only Report
open access

Tensile and Pack Compressive Tests of Some Sheets of Aluminum Alloy, 1025 Carbon Steel, and Chromium-Nickel Steel

Description: "Tensile and compressive stress-strain curves, stress-deviation curves, and secant modulus-stress curves are given for longitudinal and transverse specimens of 17S-T, 24S-T, and 24S-RT aluminum-alloy sheet in thicknesses from 0.032 to 0.081 inch, 1025 carbon steel sheet in thicknesses of 0.054 and 0.120 inch, and chromium-nickel steel sheet in thicknesses form 0.020 to 0.0275 inch. Significant differences were found between the tensile and the compressive stress-strain curves, and also the corr… more
Date: February 1942
Creator: Atchison, C. S. & Miller, James A.
Item Type: Refine your search to only Report
open access

Tidewater and Weather-Exposure Tests on Metals Used in Aircraft - 2

Description: "This report is an addendum to NACA Technical Note No. 736, which dealt with tidewater and weather-exposure tests being conducted by the National Bureau of Standards on various aluminum alloys, magnesium alloys, and stainless steels used in aircraft. The exposures were begun in June 1938 and were terminated, for this particular series, in June 1941. The methods of exposure and the materials being investigated are described, and the more important results obtained up to the conclusion of the sec… more
Date: February 1942
Creator: Mutchler, Willard & Galvin, W. G.
Item Type: Refine your search to only Report
open access

Torsion Tests of a Monocoque Box

Description: Report presenting testing of a monocoque box of aluminum alloy, which had torques applied to the ends. The twist, strain in the stringers, plate, and corner posts, and the buckling load were measured. A new analysis was developed for the twisting of a monocoque box reinforced by stringers, corner posts, and bulkheads, and the measured twist agreed within 10 percent of the analytical value.
Date: November 1942
Creator: Levy, Samuel; McPherson, Albert E. & Ramberg, Walter
Item Type: Refine your search to only Report
open access

The Tracer Gas Method of Determining the Charging Efficiency of Two-Stroke-Cycle Diesel Engines

Description: "A convenient method has been developed for determining the scavenging efficiency or the charging efficiency of two-stroke-cycle engines. The method consists of introducing a suitable tracer gas into the inlet air of the running engine and measuring chemically its concentration both in the inlet and exhaust gas. Monomethylamine CH(sub 3)NH(sub 2) was found suitable for the purpose as it burns almost completely during combustion, whereas the "short-circuited" portion does not burn at all and can… more
Date: January 1942
Creator: Schweitzer, P. H. & DeLuca, Frank, Jr.
Item Type: Refine your search to only Report
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